Overlaying multiple textures in one
You can do it by two ways.
First notice the UV map:

It is made as 3 parts, each corresponding to a texture.
So you can either use the new UDIM features of Blender or calculate it in a node tree.
Using UDIM tiles
Create a UDIM texture in the image editor. Check &quot;Tiled&quot;:

Add each of the textures to it (in the correct order):

From the image tab on the right, open the first image from disk with the folder button.
Once done use the &quot;+&quot; on the right of the tile list. Open the second image.
Use the &quot;+&quot; and open the third image.
At the end, you should see that:

Now you can simply use the UDIM image as a normal image in the material editor:

Without UDIM feature
If your version of Blender does not have UDIM.
You can use the following nodes, testing the UV map parts with math nodes.